it does not want to work

Hooks.h

using PlaySoundFn = void(__stdcall*)(const char*);
extern PlaySoundFn oPlaySound;
using IsReadyFn = void(__cdecl*)();

namespace O
{
	PlaySoundFn oPlaySound;
	IsReadyFn IsReady;
}

DllMain.cpp

void __stdcall PlaySound_CSGO(const char* fileName)
{
	HWND Window;
	O::oPlaySound(fileName);

	if (Interface.Engine->IsInGame() || !Options::Misc::AtutoAccept)
		return;

	//This is the beep sound that is played when we have found a game
	if (!strcmp(fileName, "!UI/competitive_accept_beep.wav")) {

		//This is the function that is called when you press the big ACCEPT button
		O::IsReady = (IsReadyFn)((DWORD)FindSignature(XorStr("client.dll"), XorStr("IsReady"), XorStr("55 8B EC 83 E4 F8 83 EC 08 56 8B 35 ? ? ? ? 57 83 BE")));
																																								 //Accept the game
		O::IsReady();

		//This will flash the CSGO window on the taskbar
		//so we know a game was found (you cant hear the beep sometimes cause it auto-accepts too fast)
		FLASHWINFO fi;
		fi.cbSize = sizeof(FLASHWINFO);
		fi.hwnd = Window;
		fi.dwFlags = FLASHW_ALL | FLASHW_TIMERNOFG;
		fi.uCount = 0;
		//Beep(100, 5);
		fi.dwTimeout = 0;
		FlashWindowEx(&fi);
	}
}